Advertisement Upgrade to remove ads


the passing of traits from parents to offspring


a characteristic that an organism can pass to its offspring through its genes


the scientific study of heredity


the process in which an egg cell and a sperm cell join to form a new organism


the offspring of many generations that have the same traits


the set of information that controlsa trait; a segment of DNA on a chromosome that codes for a specific trait


the different forms of a gene

dominant allele

an allele whose trait always shows up in the organism when the allele is present

recessive allele

an allele that is masked when a dominant allele is present


an organism that has two different alleles for a trait; an organism that is heterozygous for a particular trait


a number that describes how likely it is that an event will occur

Punnett square

a chart that shows all the possible combinations of alleles that can result from a genetic cross


an organism's physical appearance, or visible traits


an organism's genetic makeup, or allele combinations


having two identical alleles for a trait


having two different alleles for a trait


a condition in which neither of two alleles of a gene is dominant or recessive


the process that occers in the formation of sex cells (sperm and egg) by which the number of chromosomes is reduced by half

messenger RNA

RNA that copies the coded message from DNA in the nucleus and carries the message into the cytoplasm

transfer RNA

RNA in the cytoplasm that carries an amino acid to the ribosome and adds it to the growing protein chain

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording